Resolve certificate references in ONC by PEM.

chromeos/test/data/network/valid_wifi_clientcert.onc

Index: chromeos/test/data/network/valid_wifi_clientcert.onc
diff --git a/chromeos/test/data/network/valid_wifi_clientcert.onc b/chromeos/test/data/network/valid_wifi_clientcert.onc
deleted file mode 100644
index c246a399bd28a7ba84bb078a8c6923b021a09244..0000000000000000000000000000000000000000
--- a/chromeos/test/data/network/valid_wifi_clientcert.onc
+++ /dev/null
@@ -1,29 +0,0 @@
-{
-    "GUID": "{77db0089-0bc8-4358-929c-123xcv}",
-    "Type": "WiFi",
-    "Name": "SomeWifi-XY",
-    "WiFi": {
-        "SSID": "SomeWifi-XY",
-        "Security": "WPA-EAP",
-        "Recommended": [ "AutoConnect" ],
-        "EAP": {
-            "Outer": "EAP-TLS",
-            "Identity": "abc ${LOGIN_ID}@my.domain.com",
-            "UseSystemCAs": true,
-            "ClientCertType": "Pattern",
-            "ClientCertPattern": {
-                "IssuerCARef": [
-                    "{58ac1967-a0e7-49e9-be68-123abc}",
-                    "{42cb13cd-140c-4941-9fb6-456def}"
-                ],
-                "EnrollmentURI": [ "chrome-extension://delkjfjibodjclmdijflfnimdmgdagfk/generate-cert.html" ]
-            },
-            "Recommended": [ "Identity" ],
-            "SaveCredentials": true
-        }
-    },
-    "ProxySettings": {
-        "Type": "PAC",
-        "PAC": "https://proxycfg.my.domain.com/proxy.dat"
-    }
-}